Oops I didn't explain the Newspaper Mystery!

So what happened was this: last night I was checking twitter and saw a tweet from the school paper regarding the classwork. I screenshot it and sent it to Natalie and my co-editor Sarah and we were all steaming. Sarah is the only person with access to the twitter, but she didn't send the tweet. We figured it had to have been a member of the returning staff, since all of the passwords for accessing newspaper-things are the same. Anyways, we confronted the staff today and nobody knew a thing.